javascript封装的sqlite操作类实例

function sql(name,v,desc,size,tables){ this.db=null; this.name=name; this.v=v; this.desc=desc; this.size=size; this.tables=tables; this.ini();}sql.prototype.ini=function(){ var self=this; self.db=openDatabase(self.name,self.v,self.desc,self.size); self.db.transaction(function(tx){  self.tables.forEach(function(s){   tx.executeSql(s,[]);  }); });};sql.prototype.query=function(sql,opt,rs,err){ var opt=opt || []; var rs =rs || function(){}; var err=err || function(tx,e){G.alert(e.message);}; this.db.transaction(function(tx){  if(typeof(sql)=='object'){   sql.forEach(function(s){    tx.executeSql(s,opt,rs,err);   });  }else{   tx.executeSql(sql,opt,rs,err);  } });};

var tbs=[  'CREATE TABLE IF NOT EXISTS cfrids(id varchar(32) PRIMARY KEY,jfs INT,jfx varchar(64),jxx TEXT,ct INT,uinfo TEXT,jia INT,zt INT,bz varchar(16),yue INT)',  'CREATE INDEX IF NOT EXISTS ct_a ON cfrids(ct)',  'CREATE TABLE IF NOT EXISTS cliao(id varchar(32) PRIMARY KEY,uid varchar(32),nr TEXT,ct INT,ty varchar(8),ismy INT)',  'CREATE INDEX IF NOT EXISTS uid_a ON cliao(uid)',  'CREATE TABLE IF NOT EXISTS czliao(id varchar(32) PRIMARY KEY,nr TEXT,ty varchar(8),ct INT,num INT)'];  var db=new sql('imdata'+z,'1.0','user data',1048576,tbs);  db.query('insert into cliao (id,uid,nr,ct,ty,ismy) values (?,?,?,?,?,?)',['afasdf','asdfa','saadf','eeee','rrrr',1]);  db.query('select * from cliao where uid=? order by ct desc limit ?,10',['22',50],function(tx,rs){   var l=rs.rows.length;});